Graphene-Modified Continuous-Fiber Composites for Additive Manufacturing
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Solution Overview
Problem
Current additive manufacturing techniques for continuous-fiber reinforced composites, such as FDM and LOM, face challenges with poor interlayer bonding, high porosity, and low fiber-matrix bonding strength, limiting the mechanical properties and widespread application of these materials.
Innovation Solution
The development of laser-assisted laminated object manufacturing (LA-LOM) using prepreg sheets with graphene-modified interfaces, where layers of continuous-fiber reinforced sheets are welded together using a laser to form a laminate structure, enhancing interfacial bonding and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If FDM or LOM techniques are used to fabricate continuous-fiber reinforced composites, then additive manufacturing capability is achieved, but interlayer bonding strength deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the bonding process parameters - using laser heating to raise the temperature of the polymer matrix above its glass transition or melting point, enabling thermoplastic bonding behavior. This thermal parameter change allows the matrix to become more compliant and form stronger bonds between layers, directly addressing the weak interlayer bonding issue in conventional FDM and LOM processes.
Solution Approach 2:
The patent replaces conventional mechanical bonding methods (pressure alone, adhesive bonding) with laser-assisted thermal bonding. Instead of relying on mechanical pressure or external adhesives, the system uses laser energy to locally heat and activate the polymer matrix, enabling self-bonding through thermoplastic flow and interdiffusion, thereby achieving stronger interlayer bonds without additional materials or complex mechanical systems.
2Device complexity
If conventional AM techniques are used for CFRPCs, then manufacturing simplicity is maintained, but porosity increases
Solution Approach 1:
The patent implements continuous useful action through the integrated laser heating and rolling process. The laser continuously heats the polymer matrix along the bonding interface while the roller simultaneously applies pressure, maintaining continuous thermal and mechanical activation throughout the bonding zone. This continuous action ensures complete matrix flow and void elimination, producing dense, low-porosity bonds without interrupting the manufacturing process.
3Ease of manufacture
If traditional bonding methods are used for prepreg sheets, then process simplicity is maintained, but fiber-matrix bonding strength deteriorates
Solution Approach 1:
The patent applies self-service by enabling the polymer matrix to bond to itself through laser-induced thermoplastic flow. The laser heating activates the matrix material in situ, allowing it to flow, interdiffuse, and bond with adjacent layers without requiring external adhesives or complex chemical treatments. The material essentially bonds itself through the localized thermal energy input, simplifying the process while enhancing fiber-matrix bonding strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method results in 3D parts with improved interlaminar bonding, increased strength, reduced porosity, and superior mechanical properties, including tensile strength and flexural strength, compared to traditional AM processes.
Implementation Method 1
A laser is directed through the at least one additional continuous-fiber reinforced sheet to a bonding interface between the at least one additional continuous-fiber reinforced sheet and the first continuous-fiber reinforced sheet to heat polymer matrix material in the at least one additional continuous-fiber reinforced sheet and the first continuous-fiber reinforced sheet
Implementation Method 2
The sheets are fed through a rolled compaction process
Data Source
AI summary
Additive manufacturing of continuous-fiber reinforced composites. More particularly, aspects of the invention relate to additive manufacturing systems and methods for fabricating 3D parts from continuous-fiber reinforced composites such as carbon-fiber or glass-fiber pre impregnated (“pre-preg”) sheets. A laser-assisted laminated object manufacturing method is used to fabricate continuous carbon fiber reinforced polymer composites (CFRPCs) using prepreg sheets with continuous-carbon fiber reinforcement. Graphene functions as a modifier between the prepreg sheets to improve the mechanical properties of the CFRPCs, specifically low porosity, high concentrations of continuous carbon fibers, and improved interfacial bonding strength. This composite architecture design, involving laminated continuous-carbon fiber reinforced prepreg sheets and graphene-modified interfaces, provides a readily scalable manufacturing method for producing 3D parts with desirable characteristics.